WO2010095742A1 - 金属積層膜用エッチング液組成物 - Google Patents
金属積層膜用エッチング液組成物 Download PDFInfo
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- WO2010095742A1 WO2010095742A1 PCT/JP2010/052662 JP2010052662W WO2010095742A1 WO 2010095742 A1 WO2010095742 A1 WO 2010095742A1 JP 2010052662 W JP2010052662 W JP 2010052662W WO 2010095742 A1 WO2010095742 A1 WO 2010095742A1
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
- C23F1/20—Acidic compositions for etching aluminium or alloys thereof
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- H10P50/691—
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
- C23F1/26—Acidic compositions for etching refractory metals
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/44—Compositions for etching metallic material from a metallic material substrate of different composition
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/3213—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer
- H01L21/32133—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only
- H01L21/32134—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only by liquid etching only
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- H10P50/667—
Definitions
- the present invention relates to an etching solution composition for a metal laminate film, which is used for forming gate, source and drain electrodes of a liquid crystal display.
- Aluminum or an alloy obtained by adding impurities such as neodymium, silicon, copper to aluminum is inexpensive and has low resistance, and is therefore used as a gate, source and drain electrode material for liquid crystal displays.
- aluminum or aluminum alloy has slightly poor adhesion to the underlying glass substrate, it is used as an electrode material as a laminated film using a molybdenum or molybdenum alloy film underneath aluminum or aluminum alloy, such as phosphoric acid. Batch etching was performed with an etching solution using
- titanium or titanium alloys are attracting attention because of the rising prices of molybdenum or molybdenum alloys.
- etching of titanium or a titanium alloy is impossible with an etching solution using phosphoric acid or the like for etching an aluminum / molybdenum laminated film.
- Patent Document 1 In the manufacturing process of a semiconductor device, when etching titanium or a titanium alloy, it is generally known to use a hydrofluoric acid etching solution (for example, Patent Document 1). It is also known that a metal thin film mainly composed of titanium can be etched using an ammonia + hydrogen peroxide etching solution (for example, Patent Document 2). Furthermore, in the case of etching a titanium / aluminum / titanium laminated film, an etching solution composed of a fluorine compound and an oxidizing agent has been reported (Patent Document 3).
- the etching amount of the upper aluminum layer greatly exceeds the etching amount of the lower titanium layer, thereby increasing the side etching, and according to the resist pattern. This causes a problem that the wiring cannot be formed. This is the same even when an etching solution composed of a fluorine compound and an oxidizing agent is used for etching of the aluminum / titanium laminated film.
- an etching solution composed of a fluorine compound and an oxidizing agent is used for etching of the aluminum / titanium laminated film.
- the uppermost layer film is aluminum, it depends on the chemical solution than when the uppermost layer film is titanium. It is easy to be affected, and a highly accurate etching process becomes difficult. In the case of an ammonia + hydrogen peroxide etching solution, the etching rate of aluminum or titanium is remarkably low, and the basicity is not practical because the stability of hydrogen peroxide is reduced and the life of the solution is shortened.
- etching a metal laminated film in which a layer made of aluminum or an aluminum alloy is laminated on the upper side and a layer made of titanium or a titanium alloy is laminated on the lower side side etching can be suppressed and a good cross-sectional shape can be obtained. It is an object of the present invention to provide an etching solution composition and a method for collectively etching the metal laminated film.
- the inventors are able to greatly reduce the side etching amount of the aluminum / titanium laminated film by adding a small amount of iron ions to an etching solution containing a fluorine compound while continuing intensive research. As a result, the present invention has been completed.
- the present invention is an etching solution composition containing a fluorine compound and iron ions, and collectively etches a metal laminated film in which a layer made of aluminum or an aluminum alloy is laminated on the upper side and a layer made of titanium or a titanium alloy is laminated on the lower side. It is related with the said etching liquid composition used for this.
- the present invention also relates to the above-mentioned etching solution composition further comprising one or more selected from the group consisting of nitric acid, hydrochloric acid, perchloric acid, and methanesulfonic acid.
- the present invention further relates to the above etchant composition further comprising phosphorous acid and / or phosphoric acid.
- the present invention further relates to the above-mentioned etching solution composition, wherein the pH is 2 or less.
- the present invention also relates to the above etching solution composition containing a fluorine compound at a concentration of 0.01 to 0.5 mol / L and iron ions at a concentration of 0.0001 to 0.05 mol / L. Furthermore, the present invention contains one or more selected from the group consisting of nitric acid, hydrochloric acid, perchloric acid, and methanesulfonic acid at a total concentration of 0.01 to 1.0 mol / L. The present invention relates to an etching solution composition. Furthermore, the present invention relates to the above-described etching solution composition containing phosphorous acid and / or phosphoric acid at a total concentration of 0.001 to 0.1 mol / L.
- the present invention also provides 0.01 to 0.5 mol / L of hydrofluoric acid, 0.0001 to 0.05 mol / L of trivalent iron ions, 0.01 to 1.0 mol / L of nitric acid, and phosphorous acid.
- the present invention relates to the etching solution composition used for batch etching.
- the present invention further uses an etching solution composition containing a fluorine compound and iron ions to collectively etch a metal laminated film in which a layer made of aluminum or an aluminum alloy is laminated on the upper side and a layer made of titanium or a titanium alloy is laminated on the lower side. Regarding the method.
- the present invention still further relates to the above method, wherein the etching solution composition further comprises one or more selected from the group consisting of nitric acid, hydrochloric acid, perchloric acid, and methanesulfonic acid.
- the present invention also relates to the above method, wherein the etchant composition further comprises phosphorous acid and / or phosphoric acid.
- the present invention relates to the above method, wherein the pH of the etching solution composition is 2 or less.
- the present invention relates to the above method, wherein the etching solution composition comprises a fluorine compound at a concentration of 0.01 to 0.5 mol / L and iron ions at a concentration of 0.0001 to 0.05 mol / L. .
- the etching solution composition may be one or more selected from the group consisting of nitric acid, hydrochloric acid, perchloric acid, and methanesulfonic acid at a total concentration of 0.01 to 1.0 mol / L. Including the above method.
- the present invention further relates to the method as described above, wherein the etchant composition comprises phosphorous acid and / or phosphoric acid at a total concentration of 0.001 to 0.1 mol / L.
- the present invention further provides 0.01 to 0.5 mol / L of hydrofluoric acid, 0.0001 to 0.05 mol / L of trivalent iron ions, 0.01 to 1.0 mol / L of nitric acid, and sublimation.
- the etching solution composition of the present invention can further suppress the side etching by adding a pH adjusting agent, a taper angle adjusting agent, etc., and also suppress the generation of titanium residues and the erosion of the glass substrate. It has excellent etching characteristics that enables the etching to be performed with higher accuracy, the shape of which can be adjusted in the range of vertical to forward taper.
- iron ions When iron ions come into contact with aluminum, which has a lower redox potential (high ionization tendency), it is reduced (receives electrons) and adsorbs to the aluminum surface, and the aluminum is oxidized (releases electrons) and dissolves. To do. It is well known that trivalent iron ions have an effect of promoting dissolution of aluminum, for example, in an aluminum etching solution using ferric chloride (for example, Patent Documents 4 and 5).
- the object to be etched is an aluminum / titanium laminated film
- the titanium film is exposed as the aluminum film disappears, so that the battery effect works between the two metal films, and the etching of titanium with a lower oxidation-reduction potential is promoted. Since aluminum is on the side for receiving electrons, the etching rate decreases. Further, the iron particles adsorbed on the surface of the aluminum film are released by the disappearance of the aluminum film, and are re-dissolved by the action of nitric acid or hydrofluoric acid during the etching of the titanium film and the subsequent over-etching process. Return to the iron ion.
- the etching of aluminum can be promoted during the etching of the upper aluminum film, and the etching of aluminum can be suppressed after the titanium film is exposed.
- side etching due to excessive dissolution of aluminum can be suppressed, and iron ions are re-dissolved after being adsorbed, and thus can be reused as an oxidizing agent.
- iron ions are added to the etching solution of the aluminum / titanium laminated film, the effects more than those recognized in the conventional aluminum etching solution are exhibited.
- Iron ions have an effect of suppressing side etching by accelerating the etching of aluminum during the etching of the upper aluminum film and not participating in the etching after the exposure of the lower titanium film.
- Any iron ion source may be used as long as it is a compound capable of dissociating trivalent iron ions in a liquid, such as ferric nitrate and ferric chloride, but ferric nitrate is preferred.
- ferric nitrate is preferred.
- an equivalent addition effect can be obtained.
- the initial performance of the etching solution may change due to the effect of the oxidation-reduction reaction in which divalent iron ions are oxidized to trivalent iron ions. Iron compounds are preferred.
- the compounding amount of iron ions varies depending on the etching solution composition and the like, but is preferably 0.0001 to 0.05 mol / L, more preferably 0.001 to 0.03 mol / L.
- the etching solution composition of the present invention is mainly a fluorine compound that etches aluminum and titanium. Any fluorine compound may be used, but hydrofluoric acid or ammonium fluoride is desirable.
- the compounding amount of the fluorine compound varies depending on the film thickness of the aluminum / titanium laminated film and the desired etching time, but is preferably 0.01 to 0.5 mol / L, more preferably 0.03 to 0.3 mol / L. is there.
- the preferred pH for titanium etching is 2 or less.
- the role of the pH adjuster is to reduce the pH of the etchant composition to make it strongly acidic, to prepare an environment in which aluminum and titanium are easily dissolved, to suppress the amount of HF 2 ⁇ generated from a fluorine compound, and to a glass substrate It is to suppress the erosion of.
- the pH of the etching solution composition is preferably 2 or less, more preferably 1.5 or less, in order to achieve both suppression of titanium residue after etching of the aluminum / titanium multilayer film and suppression of glass substrate erosion. is there.
- any acid can be used as long as it can lower the pH of the etching solution to 2 or less, more preferably 1.5 or less without adversely affecting the etching of titanium. Since it is possible to suppress the increase in liquid viscosity and cost when the pH can be lowered, it is desirable to use a strong acid.
- the blending amount of the pH adjusting agent is preferably 0.01 to 1.0 mol / L in total, and more preferably 0.05 to 0.5 mol / L in total.
- the lower titanium film is exposed while the side etching of the upper aluminum film is small due to the action of trivalent iron ions. Further, after the titanium film is exposed, the etching rate of aluminum decreases due to the battery effect. For this reason, when the overetching process is performed with reference to the just etching time of the aluminum / titanium laminated film, the side titanium film is more likely to have a reverse taper shape in which the side etching of the lower layer titanium film proceeds than the upper layer aluminum film.
- a taper angle adjusting agent may be further added to the etching solution composition of the present invention.
- the taper angle adjusting agent anything may be used as long as it has an effect of adjusting the cross-sectional shape, but it does not affect the etching rate of aluminum, and shows the effect of reducing the etching rate of the titanium film.
- Phosphorous acid and phosphoric acid are preferred, and two or more of these may be blended simultaneously. Most preferred is phosphorous acid.
- the blending amount of the taper angle adjusting agent is basically limited to a very small amount, it is difficult to have an effect of adjusting the pH of the etching solution to 2 or less, more preferably 1.5 or less. For this reason, the taper angle adjusting agent and the pH adjusting agent cannot be combined with the same compound.
- the necessary amount of the taper angle adjusting agent varies depending on the content of other substances, but is preferably 0.001 to 0.1 mol / L in total, and more preferably 0.005 to 0.05 mol / L.
- the most preferable form of the etching solution composition of the present invention is hydrofluoric acid 0.01 to 0.5 mol / L, trivalent iron ion 0.0001 to 0.05 mol / L.
- the present invention also provides a batch etching method using the above etching solution composition. According to the method of the present invention, it is possible to etch an aluminum / titanium laminated film, which has conventionally been difficult to perform highly accurate etching due to the large number of side etchings, with high accuracy, and to form a wiring according to a resist pattern. It becomes possible to do.
- the etching solution composition used in the method of the present invention contains a fluorine compound and iron ions.
- a fluorine compound and iron ions By using this etching solution composition, the etching of the upper aluminum (alloy) layer is promoted, and when the lower titanium layer is exposed, titanium, aluminum, and the etching solution composition are used. From the relationship of the oxidation-reduction potential of the iron ions therein, the etching of the aluminum layer can be suppressed and a suitable side etching amount can be obtained when the etching is completed. Therefore, it is possible to overcome the problem of the high etching accuracy caused by the large amount of side etching at the time of batch etching, which has been a problem in the past.
- the etching solution composition used in the method of the present invention may further contain a pH adjusting agent.
- a pH adjusting agent By lowering the pH, titanium etching proceeds more.
- the pH is preferably 2 or less.
- the pH is adjusted to 2 or less and addition does not adversely affect the etching of titanium, it is preferably a strong acid, particularly preferably nitric acid, hydrochloric acid, perchloric acid or methanesulfonic acid, most preferably nitric acid. .
- the etchant composition used in the method of the present invention may further contain a taper angle adjusting agent.
- a taper angle adjusting agent By adding the taper angle adjusting agent, it is possible to prevent the etching cross section from becoming an inversely tapered shape.
- the taper angle adjusting agent is preferably phosphoric acid, phosphorous acid, or a combination thereof, and most preferably phosphorous acid.
- the etching solution composition used in the method of the present invention can also contain all the above-mentioned additional additives.
- the most preferable etching solution composition used in the method of the present invention is hydrofluoric acid, 0.01-0.5 mol / L, trivalent iron ions, 0.0001-0.05 mol / L, nitric acid. Is an etching solution composition containing 0.01 to 1.0 mol / L and phosphorous acid at a concentration of 0.001 to 0.1 mol / L.
- etching solution composition By using such an etching solution composition, it is possible to perform high-accuracy collective etching in which the amount of side etching is suppressed, the etching residue is reduced while preventing the glass substrate from being eroded, and the cross-sectional shape is tapered.
- the etching rate is low at low temperatures and the required etching time may be too long, and the etching rate is high at high temperatures and the controllability of etching is reduced.
- the temperature is preferably 30 to 50 ° C.
- EXAMPLE After forming a titanium film (350 mm) on a glass substrate by sputtering, an aluminum film (2700 mm) was further formed by sputtering, and a substrate was prepared in which an aluminum layer was laminated on the upper part and a titanium layer was laminated on the lower part. Subsequently, patterning was performed on the aluminum / titanium laminated film using a resist, thereby completing an aluminum / titanium laminated film substrate.
- This aluminum / titanium laminated film substrate was immersed in the etching solutions shown in the Examples and Comparative Examples at a solution temperature of 40 ° C. under stirring conditions for 1.5 times the just etching time, and an etching treatment was performed. Then, SEM observation was performed with the sample which performed water washing and the drying process, and the performance of each etching liquid was compared.
- Etching was performed with the composition shown in the table below, and the amount of side etching was compared between the composition with and without ferric nitrate added. As can be seen from Table 1, the amount of side etching is greatly reduced by the addition of a small amount of ferric nitrate. In the composition in which ferric nitrate was not added, the side etching amount did not fall below 1 ⁇ m. On the other hand, with the added composition, it was possible to suppress the side etching amount to less than 1 ⁇ m even with the addition of a small amount of ferric nitrate. Nitric acid added as a pH adjuster and phosphoric acid or phosphorous acid added as a taper angle adjuster did not significantly affect the side etching amount.
- the amount of side etching is less than 1 ⁇ m, and the etching solution composition of the present invention can be used regardless of the type of fluorine compound. It can be seen that the aluminum / titanium laminated film substrate can be etched with high accuracy.
- the reduction of the side etching amount is greatly affected by iron ions, and even by the slight addition of the amount, the side etching amount can be greatly reduced.
- the effect is the kind of fluorine compound and pH adjustment. It can be seen that it is hardly affected by the presence of the agent and the taper angle adjusting agent. Therefore, it is possible to further add an appropriate amount of a pH adjusting agent for the purpose of suppressing titanium residue and a taper angle adjusting agent for the purpose of adjusting the cross-sectional shape.
- Reference example 1 In order to confirm the function of the pH adjuster, etching treatment was performed with the composition shown in the following table, and the presence or absence of titanium residue on the surface of the glass substrate was observed. As can be seen from Table 2, in the etching solution composition to which the pH adjusting agent was added, no titanium residue was confirmed in any of the pH adjusting agents.
- the present invention can be used as an etching solution composition for a metal laminate film used for making a gate, source and drain electrodes of a liquid crystal display.
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Abstract
Description
本発明はさらに、亜りん酸および/またはりん酸をさらに含む、上記のエッチング液組成物に関する。
本発明はさらにまた、pHが2以下であることを特徴とする、上記のエッチング液組成物に関する。
さらに、本発明は、硝酸、塩酸、過塩素酸、メタンスルホン酸からなる群から選択される1種または2種以上を、合計0.01~1.0mol/Lの濃度で含有する、上記のエッチング液組成物に関する。
さらにまた、本発明は、亜りん酸および/またはりん酸を、合計0.001~0.1mol/Lの濃度で含有する、上記のエッチング液組成物に関する。
本発明はさらに、フッ素化合物および鉄イオンを含むエッチング液組成物を用いて、上部にアルミニウムまたはアルミニウム合金からなる層、下部にチタンまたはチタン合金からなる層が積層された金属積層膜を一括エッチングする方法に関する。
また、本発明は、エッチング液組成物が、亜りん酸および/またはりん酸をさらに含む、上記の方法に関する。
さらに、本発明は、エッチング液組成物のpHが、2以下であることを特徴とする、上記の方法に関する。
さらにまた、本発明は、エッチング液組成物が、フッ素化合物を、0.01~0.5mol/L、および鉄イオンを、0.0001~0.05mol/Lの濃度で含む、上記の方法に関する。
本発明はさらに、エッチング液組成物が、亜りん酸および/またはりん酸を、合計0.001~0.1mol/Lの濃度で含む、上記の方法に関する。
本発明はさらにまた、フッ化水素酸を0.01~0.5mol/L、3価の鉄イオンを0.0001~0.05mol/L、硝酸を0.01~1.0mol/Lならびに亜りん酸を0.001~0.1mol/Lの濃度で含むエッチング液組成物を用いて、上部にアルミニウムまたはアルミニウム合金からなる層、下部にチタンまたはチタン合金からなる層が積層された金属積層膜を一括エッチングする方法に関する。
また、本発明のエッチング液組成物は、さらにpH調整剤やテーパー角調整剤などを添加することによって、サイドエッチングを抑制するだけでなく、チタン残渣の発生やガラス基板の浸食を抑えたり、断面形状を垂直~順テーパーの範囲で調節できる、より精度の高いエッチングを行うことが可能となる、優れたエッチング特性を有する。
鉄イオンは、酸化還元電位がより卑な(イオン化傾向が大きい)アルミニウムと接触すると、還元されて(電子を受け取って)アルミニウム表面に吸着し、アルミニウムは酸化されて(電子を放出して)溶解する。なお、3価の鉄イオンにアルミニウム溶解の促進効果があることは、塩化第二鉄を用いたアルミニウムのエッチング液などでよく知られている(例えば特許文献4,5)。
本発明のエッチング液組成物で加工するアルミニウム/チタン積層膜はガラス基板上に形成されているが、フッ素化合物を含有するエッチング液はフッ化水素を遊離するため、ガラスを浸食する。一般にフッ化水素は液中で以下のように解離する。
HF ⇔ H+ + F- (1)
HF + F- ⇔ HF2 - (2)
これらのことより、アルミニウム/チタン積層膜エッチング後のチタン残渣の抑制と、ガラス基板浸食の抑制を両立するには、エッチング液組成物のpHは好ましくは2以下、より好ましくは1.5以下である。
以上のことから、本発明のエッチング液組成物のもっとも好ましい形態としては、フッ化水素酸を、0.01~0.5mol/L、3価の鉄イオンを0.0001~0.05mol/L、硝酸を0.01~1.0mol/Lならびに亜りん酸を0.001~0.1mol/Lの濃度で含むエッチング液組成物である。
本発明の方法によれば、従来サイドエッチングの多さにより、高精度なエッチング処理が困難であったアルミニウム/チタン積層膜を、高精度でエッチングすることが可能となり、レジストパターン通りの配線形成をすることが可能となる。
以下に、実施例と比較例を挙げて本発明を詳細に説明するが、本発明はこれら実施例に限定されるものではない。
ガラス基板上にスパッタリング法によりチタン膜(350Å)を形成後、さらにスパッタリング法でアルミニウム膜(2700Å)を形成し、上部にアルミニウム層、下部にチタン層が積層された基板を準備した。続いて、アルミニウム/チタン積層膜上にレジストを用いてパターニングを行い、アルミニウム/チタン積層膜基板を完成させた。
このアルミニウム/チタン積層膜基板を、実施例および比較例に示したエッチング液に、液温40℃、撹拌条件でジャストエッチング時間の1.5倍の時間浸漬し、エッチング処理を行った。その後、水洗、乾燥処理を実施したサンプルでSEM観察を行い、各エッチング液の性能を比較した。
pH調整剤の機能を確認するため、下表に示す組成でエッチング処理を行い、ガラス基板表面のチタン残渣の有無を観察した。
Claims (16)
- フッ素化合物と鉄イオンを含むエッチング液組成物であって、上部にアルミニウムまたはアルミニウム合金からなる層、下部にチタンまたはチタン合金からなる層が積層された金属積層膜を一括エッチングするのに用いられる、前記エッチング液組成物。
- 硝酸、塩酸、過塩素酸、メタンスルホン酸からなる群から選択される1種または2種以上をさらに含む、請求項1に記載のエッチング液組成物。
- 亜りん酸および/またはりん酸をさらに含む、請求項1または2に記載のエッチング液組成物。
- pHが2以下であることを特徴とする、請求項1~3のいずれかに記載のエッチング液組成物。
- フッ素化合物を、0.01~0.5mol/L、および鉄イオンを、0.0001~0.05mol/Lの濃度で含む、請求項1~4のいずれかに記載のエッチング液組成物。
- 硝酸、塩酸、過塩素酸、メタンスルホン酸からなる群から選択される1種または2種以上を、合計0.01~1.0mol/Lの濃度で含む、請求項2~5のいずれかに記載のエッチング液組成物。
- 亜りん酸および/またはりん酸を、合計0.001~0.1mol/Lの濃度で含む、請求項3~6のいずれかに記載のエッチング液組成物。
- フッ化水素酸を0.01~0.5mol/L、3価の鉄イオンを0.0001~0.05mol/L、硝酸を0.01~1.0mol/Lならびに亜りん酸を0.001~0.1mol/Lの濃度で含むエッチング液組成物であって、上部にアルミニウムまたはアルミニウム合金からなる層、下部にチタンまたはチタン合金からなる層が積層された金属積層膜を一括エッチングするのに用いられる、前記エッチング液組成物。
- フッ素化合物および鉄イオンを含むエッチング液組成物を用いて、上部にアルミニウムまたはアルミニウム合金からなる層、下部にチタンまたはチタン合金からなる層が積層された金属積層膜を一括エッチングする方法。
- エッチング液組成物が、硝酸、塩酸、過塩素酸、メタンスルホン酸からなる群から選択される1種または2種以上をさらに含む、請求項9に記載の方法。
- エッチング液組成物が、亜りん酸および/またはりん酸をさらに含む、請求項9または10に記載の方法。
- エッチング液組成物のpHが、2以下であることを特徴とする、請求項9~11のいずれかに記載の方法。
- エッチング液組成物が、フッ素化合物を、0.01~0.5mol/L、および鉄イオンを、0.0001~0.05mol/Lの濃度で含む、請求項9~12のいずれかに記載の方法。
- エッチング液組成物が、硝酸、塩酸、過塩素酸、メタンスルホン酸からなる群から選択される1種または2種以上を、合計0.01~1.0mol/Lの濃度で含む、請求項10~13のいずれかに記載の方法。
- エッチング液組成物が、亜りん酸および/またはりん酸を、合計0.001~0.1mol/Lの濃度で含む、請求項11~14のいずれかに記載の方法。
- フッ化水素酸を0.01~0.5mol/L、3価の鉄イオンを0.0001~0.05mol/L、硝酸を0.01~1.0mol/Lならびに亜りん酸を0.001~0.1mol/Lの濃度で含むエッチング液組成物を用いて、上部にアルミニウムまたはアルミニウム合金からなる層、下部にチタンまたはチタン合金からなる層が積層された金属積層膜を一括エッチングする方法。
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| Application Number | Priority Date | Filing Date | Title |
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| US13/201,955 US9039915B2 (en) | 2009-02-23 | 2010-02-23 | Etching solution compositions for metal laminate films |
| CN201080008820.5A CN102326235B (zh) | 2009-02-23 | 2010-02-23 | 金属层积膜用蚀刻液组合物 |
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| JP2009-039116 | 2009-02-23 | ||
| JP2009039116A JP5406556B2 (ja) | 2009-02-23 | 2009-02-23 | 金属積層膜用エッチング液組成物 |
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| US (1) | US9039915B2 (ja) |
| JP (1) | JP5406556B2 (ja) |
| KR (1) | KR20110129880A (ja) |
| CN (1) | CN102326235B (ja) |
| WO (1) | WO2010095742A1 (ja) |
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| JP5544898B2 (ja) * | 2010-01-25 | 2014-07-09 | 東ソー株式会社 | タングステンのエッチング液 |
| KR102279498B1 (ko) * | 2013-10-18 | 2021-07-21 | 주식회사 동진쎄미켐 | 금속 배선 식각액 조성물 및 이를 이용한 금속 배선 형성 방법 |
| TWI634825B (zh) | 2013-11-28 | 2018-09-01 | 東洋鋁股份有限公司 | Circuit board manufacturing method and circuit board |
| KR20150107354A (ko) * | 2014-03-14 | 2015-09-23 | 동우 화인켐 주식회사 | 아인산을 포함하는 금속막용 식각액 조성물 |
| JP2016025321A (ja) * | 2014-07-24 | 2016-02-08 | 関東化學株式会社 | エッチング液組成物およびエッチング方法 |
| US20170278879A1 (en) * | 2014-09-03 | 2017-09-28 | Sharp Kabushiki Kaisha | Method for manufacturing metal lamination film, method for manufacturing semiconductor device, and method for manufacturing liquid crystal display device |
| JP6444118B2 (ja) * | 2014-09-29 | 2018-12-26 | 東洋アルミニウム株式会社 | 回路基板の製造方法 |
| KR102545801B1 (ko) * | 2015-12-04 | 2023-06-21 | 솔브레인 주식회사 | 식각용 조성물 및 이를 이용한 반도체 소자의 제조방법 |
| KR102623996B1 (ko) * | 2016-11-10 | 2024-01-11 | 동우 화인켐 주식회사 | 식각액 조성물 및 이를 이용한 식각방법 및 이를 이용한 표시 장치용 어레이 기판의 제조방법 |
| KR102007428B1 (ko) * | 2017-03-09 | 2019-08-05 | 코닝 인코포레이티드 | 글라스 지지체에 의하여 지지되는 금속 박막의 제조방법 |
| KR102368026B1 (ko) * | 2018-02-06 | 2022-02-24 | 동우 화인켐 주식회사 | 금속막 식각액 조성물 및 이를 이용한 도전 패턴 형성 방법 |
| JP7518169B2 (ja) * | 2019-12-20 | 2024-07-17 | バーサム マテリアルズ ユーエス,リミティド ライアビリティ カンパニー | Co/cu選択的ウェットエッチング液 |
| CN113667979A (zh) * | 2021-08-05 | 2021-11-19 | Tcl华星光电技术有限公司 | 铜钼金属蚀刻液及其应用 |
| CN113774383B (zh) * | 2021-08-05 | 2023-07-18 | 南京三乐集团有限公司 | 一种纯铁材料表面镀镍层的低腐蚀褪镍组合物及方法 |
| US20240191361A1 (en) * | 2022-12-09 | 2024-06-13 | Tokyo Ohka Kogyo Co., Ltd. | Chemical solution for removing precious metal, method for manufacturing chemical solution, method for treating substrate, method for manufacturing semiconductor device |
| CN115948746B (zh) * | 2022-12-30 | 2024-04-30 | 浙江奥首材料科技有限公司 | 一种Al/Mo蚀刻液、其制备方法与应用 |
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- 2010-02-23 KR KR1020117020624A patent/KR20110129880A/ko not_active Withdrawn
- 2010-02-23 CN CN201080008820.5A patent/CN102326235B/zh not_active Expired - Fee Related
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| JP2010199121A (ja) | 2010-09-09 |
| CN102326235A (zh) | 2012-01-18 |
| CN102326235B (zh) | 2015-05-20 |
| JP5406556B2 (ja) | 2014-02-05 |
| US9039915B2 (en) | 2015-05-26 |
| KR20110129880A (ko) | 2011-12-02 |
| US20110297873A1 (en) | 2011-12-08 |
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